if (document.images) {            // Active Images
            img0on = new Image();      
            img0on.src = "tablon_on.gif";
            img1on = new Image();      
            img1on.src = "tablon1_on.gif";
  	   
			 
			  
			  

            img0off = new Image();      
            img0off.src = "tablon_off.gif";
	    img1off = new Image();      
            img1off.src = "tablon1_off.gif";
  	    
        


        }

// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}

// Function to 'activate' images.
function imgClick(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "click.src");
        }
}